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Range DescriptionAotus vociferans occurs north of the Rio Amazonas-Solomões, west from the Rio Negro. It occurs south of the Rio Solimões in a small incursion either side of the mouth and lowermost reaches of the Rio Purus. West it extends into Peru north of the Río Amazonas and Marañón, not extending it would seem right to the Rio Marañón, with a narrow belt along the north of the river being occupied by A. nancymaae (Aquino and Encarnación 1994a). It extends north through the Ecuadorian Amazon into Colombia to the Río Guaviare, probably extending east as far the ríos Negro, Atabapo and Orinoco (Hernández-Camacho and Cooper 1976; Defler 2003, 2004).